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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef GIN_HANDLE_H_
- #define GIN_HANDLE_H_
- #include "base/memory/raw_ptr.h"
- #include "gin/converter.h"
- namespace gin {
- // You can use gin::Handle on the stack to retain a gin::Wrappable object.
- // Currently we don't have a mechanism for retaining a gin::Wrappable object
- // in the C++ heap because strong references from C++ to V8 can cause memory
- // leaks.
- template<typename T>
- class Handle {
- public:
- Handle() : object_(nullptr) {}
- Handle(v8::Local<v8::Value> wrapper, T* object)
- : wrapper_(wrapper),
- object_(object) {
- }
- bool IsEmpty() const { return !object_; }
- void Clear() {
- wrapper_.Clear();
- object_ = NULL;
- }
- T* operator->() const { return object_; }
- v8::Local<v8::Value> ToV8() const { return wrapper_; }
- T* get() const { return object_; }
- private:
- v8::Local<v8::Value> wrapper_;
- raw_ptr<T> object_;
- };
- template<typename T>
- struct Converter<gin::Handle<T> > {
- static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
- const gin::Handle<T>& val) {
- return val.ToV8();
- }
- static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
- gin::Handle<T>* out) {
- T* object = NULL;
- if (!Converter<T*>::FromV8(isolate, val, &object)) {
- return false;
- }
- *out = gin::Handle<T>(val, object);
- return true;
- }
- };
- // This function is a convenient way to create a handle from a raw pointer
- // without having to write out the type of the object explicitly.
- template<typename T>
- gin::Handle<T> CreateHandle(v8::Isolate* isolate, T* object) {
- v8::Local<v8::Object> wrapper;
- if (!object->GetWrapper(isolate).ToLocal(&wrapper) || wrapper.IsEmpty())
- return gin::Handle<T>();
- return gin::Handle<T>(wrapper, object);
- }
- } // namespace gin
- #endif // GIN_HANDLE_H_
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